Parents demand to know 'Where's William?'

Almost a year after four-year-old toddler William Tyrrell vanished without a trace, his family have renewed search efforts demanding to know: “Where’s William?”.

During a short memorial held in the northern NSW town of Port Macquarie today, child advocacy group Bravehearts launched the new information campaign, urging anyone with any information to come forward.

“Every day is a struggle for this beautiful family,” spokeswoman Hetty Johnson told the ceremony.

Missing boy William Tyrell was last seen in his grandmother's front yard wearing a Spiderman outfit. (Supplied, NSW Police) (Supplied)

“Every day they try to keep going – not knowing what has happened to their beautiful boy.”

William vanished from his grandmother’s Kendall home on September 12 last year. Police believe he was most likely abducted and despite a massive search of the area have failed to find any sign of him.

Today’s memorial included a rendition of the song Bring Him Home, from the musical Les Misérables and sung by the production’s star Simon Gleeson.

But at its heart was an appeal for information and a question – “where is he?”

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The Where’s William campaign will see leaflets distributed to every letter box in the Port Macquarie, Taree, Kempsey and Wauchope areas, including surrounding townships and even regional addresses.

More than 8000 businesses in the surrounding 10km radius will be issued with information posters, urging anyone wither information to come forward.

Highway billboards are already in use with the advertising fees being donated.

William's family penned a heartfelt note this week.

William Tyrell (3) was playing and wearing a Spiderman costume when he disappeared on 12 September 2013 from the front of his grandmother's home in Kendall, NSW. At first it was thought he had run into nearby bushland, but police later looked at the possibility of human intervention. (Supplied)

"When we think of the plans we might make, often we question ourselves because we want so much to include William," the family said.

"How can we plan for our family's future without him and yet, do we try to make plans as if he's not with us?"

NSW police still have the case open and have searched several houses and businesses in the Port Macquarie area. South Australian detectives were even consulted last month after it emerged that the body of a small child had been found dumped by the side of a remote highway.

A septic service truck is at a property in the NSW mid-north coast as police investigate the disappearance of William Tyrell. (9NEWS) (9NEWS)

Detectives were quickly able to discount the possibility it was William and that case is also still open.

NSW police investigating William’s disappearance earlier named Bill Spedding as a “person of interest” in the case but he has not been charged.

"We need to encourage everybody to come forward with information, even if they feel it might be insignificant," Ms Johnson said.

"Please bother police, because police want to know - somebody has the key here, the police just need to join the dots on the information they already have.

"We've got to keep William's face out there, we've got to keep people looking for him."

Anyone with further information should contact Crime Stoppers on 1800 333 000.